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Paul On Thursday, May 14, 2015 7:08 AM, prasad ch <ch.kmvpra...@outlook.com> wrote: <!--#yiv2703724447 .yiv2703724447hmmessage P{margin:0px;padding:0px;}#yiv2703724447 body.yiv2703724447hmmessage{font-size:12pt;font-family:Calibri;}-->HI, In storm we have normal topology means we have spout and bolts etc.In that document they mention it is at-least-once processing ,means may be chance of processing more than once ? How can i test storm has at-least-once-processing ? please help me? While In trident is exactly once processing even this also problem for me please help me Thanks for your valuable help. Thanks & Regard's Prasad.ch